n = int(input())
if n>= 30:print('Yes')
else:print('No') n = int(input()) n int(input()) int input() input if n>= 30:print('Yes')
else:print('No') n>= 30 n 30 n = int(input()) int(input()) n
n = int(input())
if n>= 30:print('Yes')
else:print('No')